Automatic clutch operating mechanism



Feb. 13, 1951 H. w. HOFFMAN ETAL 2,541,515

AUTOMATIC CLUTCH OPERATING MECHANISM Filed Oct. 9, 1946 7 Sheets-Sheet l /V|/ENTOE5 .lfneev W fioFFMmv STA/v1. E YM CUMM/NG ATraENE Ys H. W. HOFFMAN ETAL AUTOMATIC CLUTCH OPERATING MECHANISM Feb.13,195l

7 Sheets-Sheet 2 Filed Oct. 9, 1946 HemS/I All/EDITOR'S PM K Wu n

m M2 WV M f a Feb. 13, 1951 H. w. HOFFMAN ETAL AUTOMATIC CLUTCH OPERATING MECHANISM 7 Sheets-Sheet 5 Filed Oct. 9, 1946 CLUTCH 'JTLEYM. CuMM/A/Gs Feb. 13, 1951 H w HOFFMAN ETAL AUTOMATIC CLUTCH OPERATING MECHANISM Filed Oct 9, 1946 Feb. 13, 1951 H. w. HOFFMAN ETAL 2,541,515

AUTOMATIC CLUTCH OPERATING MECHANISM Filed 001;. 9, 1946 7 Sheets-Sheet 5 Feb, 13, 1951 H. w. HOFFMAN ETAL AUTOMATIC CLUTCH OPERATING MECHANISM '7 Sheets-Sheet 6 Filed 061;. 9, 1946 SMILEY/M. CUMMINGS ATTOENEKs- Feb. 13, 1951 H. w. HOFFMAN ETAL 2,541,515

AUTOMATIC CLUTCH OPERATING MECHANISM Fla. /4

A TTOENE Y3 Patented Feb. 13, 1951 orrlcs AUTOMATIC cLU'rcn OPERATING MncHANIsM Harry William Hoffman, Anoka, Minn.-, and

Stanley Cummings, Long Beach, Calif., asa t .Wsignorsw to Federal Cartridge'Corporation, Min- 1 Application October 9, 1946, Serial No'.'702,198

' mins. (Gl.1192' 101).

-'-This invention relates tonew and useful improvements in clutch operating mechanisms, and more particularly to an'improved clutch control for heavy machinery of-the reciprocating type, such as punch presses, draw presses, shears, and the like, whereina reciprocating work-performing member is driven by a suitable, constantly rotating prime-mover or motor which is con-. nected to the reciprocating member of the machine through a suitable transmission and clutch. In an apparatus of ,theabove noted type, the clutch mechanisms are necessarily rugged, and require considerabl energy for their ,manipula: tion; consequently, it has been customary to providea control member capable of being. manipulated by an operator, and at thewill of a the opera ator, for interposinga, clutch control member in the path of operation ofa constantly rotating or r c procating m er of the, machin t ere y ,t utilize th large available energy of the machine for. p t th cl c eas t pr s t pping position. Irisuch machines the de-clutcli ing operation may not beinitiated instantane- Qusly, when the clutch control mechanism is call d upo to i t the c ut h n gu h n position, because the clutch control member must await the next cycle of movement of the press', and

accordingly, should the operator move his con trol just after the instant a de-clutching opera,- tion'could have taken'place, the movement of the clutch mechanism to de-clutching condition cannot be initiateduntil the next cycle begins. Consequently, nearly two cycles may elapse as a maximum before the machine can be stopped.

f Machinery of this character is satisfactory where slow speeds are utilized" and where the machineis operated one stroke at a time with idle'periods 'between'strokes for regulating and inspecting the 'work." Where the machine is operated at high"speeds,"'and especially where operated continuously, one stroke after another, the time available for inspection, adjustment and vile-clutching, if necessary, is so short that wholly unsatisfactory results have been obtained, with much work spoilage and tool and die" breakage asaresult, to say nothing of the loss of productio'naimejon the ma'chine. 'In addition, the use of 'au'tomatic mechanical or electrical protective devices for inspecting and otherwise protecting the-machine and the work, as the work is being progressed through the machine, are practical only when the machine can be stopped in time t? sie en am e r 1 :i T f.9 anp igct o i i s invention to provide iwanimproved machine of the neapolis, Minn, a corporation ofMinnesota aforesaid general character, a quickly operable clutch operating mechanism whereby the declutching may be instantaneously initiated at any part ofthe stroke of the machine. It is-a further object to provid an automatic instantaneously operable clutch control mecha= nism capable of being adapted to existing ma: chines with little alteration, and to provide such a control-capable of utilizing available machine energy'for instantaneously effecting a de-clutch ing" operation by actuation of a suitable controlelement, either manual or automatic It is -also an Object to provide an improved machine''f the aforesaid character utilizing stored,'instar itaneously available energy for manipulation-of a-macliine-stopping control. a

' Other and further objects of the invention-are those inherent in the apparatus herein illus trated, described and claimed. In the drawings: Figure 1 is a side elevational view of a'converi tionalpress showing our invention applied thereto: Figure 2 isa detail view showing the shuttle bar and the means for driving it; a Figure 3 is an enlarged detail sectionalvi'ew showing the means for manually actuating theusual clutch-operating rod and also showing our improved clutch rod operating mechanism as applied thereto in clutching condition; j Figure 3A is a view similar to Figure 3, but showing the clutch control member shifted to de-clutching position by the manual control and without-releasing the main drive arm; Figurel is a view similar to Figure 5, but showing the mechanism released instantaneously shifting the clutch operating rod into de-clutching-position; "Figure 5 is a View similar to Figure 4 but showing the solenoid-actuated dog in clutching positiomwhereby the mechanism is conditioned toibe automatically reset or cooked upon the next rearward movement of the shuttle bar;

Figure 6 is a detail view partially in section, showing the means for drivingly connecting the setup arm tothe secondary drive arm; Figure '7 is an enlarged detail sectional View on the'line 'I--l of Figure 3, showing the auxiliary latch for engaging and preventingthe' control latch from releasingthe secondary and primary drive arms, when the clutch operating rod is manually moved to de-clutching position; Figure 3 is a vertical sectional view on the line 8ft of Figure 3, showing the mounting Of the i imary drive arm;

Figure 9 is a vertical sectional view substantially on the line 9-9 of Figure 3, showing the mounting of the secondary drive arm and the setup arm;

Figure is a vertical sectional view on the line Ill-1L0 of Figure 3, showing the coupling member carried by the setup arm for operatively coupling the setup arm to the secondary drive arm; Figure 11 is a detail sectional plan view on the line H-I l of Figure 3, with some of the parts removed, showing the connection between the primary and secondary drive arlfns;

Figure 12 is a detail sectional plan view on the line I2-IZ of Figure 3, showing the relative positions of the control latch and the toggle arm;

Figure 13 is an enlarged detail sectional view on the line I3l3 of Figure 6; and

Figure 14 is an enlarged detail sectional view on the line I i-l4 of Figure 6. n the sele te embodim n e n e t n herein disclosed, there is illustrated in Figure l, tor purpose of disclosure, a conventional machine of the type commonly known as a press, comprising a suitable base portion 2; shown mounted on legs and 4, and having upright side frame members 5 and ii shown connectedtogether at their upper ends by a suitable cross member 1.

The usual work table or bed 8 is shown supported on the base 2 in the usual manner, and a pressure membe r ram 9. is u t d for v i a r pre: cal movement above the work table in suitable gu des ll. Re ipr ca mo ement. is, imp r ed to the; ram 9 by a crank shaft l2 through suitable co nec io s t- The crank shaft I2 is shown mounted in suite ab e. bearings 14 prov ded. in t e upper p rtio of the achine ame. spur ear 16. is secur d to one end of the crankshaft. and meshes with a p t. ion 11 keyed to a hollow shaft l8, lfhe shaft [9 ri en from a c nstan ro at ng m mb such as he conv n on ly-wheel is, by a suit,- able clutch mechanism, generally designated by the num ra 28'. Th yhee 9 ma be dri from a suitable motor 2 i by a beltdrive 22.

a utch. o ngod .3 is moun d o l n movement within the hollow shaft It and has one end op ra vel onn to e u ch mechanism 23 in any well known manner, whereby when the rod 23. is moved in one direction, the clutch will operatively connect. thev hollow shaft 18 to. the fiy-wheel 19 for direct rotation therewith, and. when moved in the opposite direction, said rod will disengage the clutch whereby the fly-wheel will idle freely without imparting rotatien to he shaft The opposite or inner end portion 2 3 of the clutch rod 23 is shown provided with a suitable member or head 25 having an operative connection with a forked arm 26 mounted for piv.- otal movement on a pivot 21, as illustrated in Figure 1,.

The arm 25 is shown having a depending portion 28 adapted to be engaged by one end of a clutch control rod or shaft 29 slidable in fixed guides 31 and 32,, Means is provided for mam uallv op rat n th c n r l red 2 to control eration of the clutch, and is shown comprising a rac ba 33 secured to the c t h n o d 29 and. meshing w th a ge segment 34 s c e to o'neend of a rock shaft 35. A suitable operating handle, not shown, may be secured to the rock shaft. 35, as is customary. By rocking the shaft 35;, longitudinal movement is imparted to the clutch control rod 29 whereby a similar movement, but in the opposite direction, is imparted to the clutch rod 23 through the arms 26-48.

In conventional machines of the type illustrated in Figure 1, means may be provided for automatically shifting the clutch control rod 29 todeecl-utching; position, to temporarily interrupt operation of the machine, in the event. something goes wrong with the work, thereby to prevent damage to the work or machine. To thus automatlcally shift the control rod 29 to tie-clutching position, the machine is shown provided with a shuttle bar 36 mounted for reciprocal movement in suitable guides at and 38 provided in the machine I'rame. The shuttle 36 is continuously operated by a cranK pin 39 secured to one end of a shaft sl driven from a shaft 42 by a pair of gears, generally designated by the numeral 43, and indicated in dotted lines in Figure 2.

The shaft 42 is driven from a shaft 44 by a pair of bevel gears 45, one of which is secured to the shaft. ll; and the oth r to the sh ft 4,4. A gear at is. shown secured to 0 19 end 01 the, shaft. 44 and meshes with a similar gear 4'1; which maybe secured directly to the hub. of the fly-wheel H for direct rotationv therewith, as indicatedv atv to in Figure 1. By this arrangement it will be noted that the shuttle bar 36 1s continuously. reciprocated when the fly-wheel is. in motion.

Under normal operating conditions, the rotary movment 01' the fly-wheel i9 provides the 116C651 sary power for shifting the clutch control rod 29 to ole-clutching position, shown in Figures 4 and 5, when the. usual trip. means, next to be. de-, scribed, is actuated.

The trip means above referred to is shown comprising a dog 48 which is pivotally mounted on the clutch control rod 29, and has a shoulder 4e adapted to be moved into the path of a lug 5t, carried by the shuttle bar 36, as indicated in dotted llnes in Figure 4. A dog actuatingarm- 52 has its intermediate portion pivotally engaged with a stud as secured to the machlne frame. A suitable connection b4 is shown operatively conneotmg one end of the arm 5; to a suitable solenoid 55, indicated in Figure 1. The opposite end portion 56 of the arm 52 is adapted to be moved upwardly into engagement with the bottom face of the dog 41;, when the cirouit. to. the solenoid is opened, whereby the shoul er 49, h he d g 48 i move i o the. path. o the. u t his. 5 a ndicated n Figure a. When h 5 0 119 i s hu s tional... h .1 s .1. the shutt e. bar l enga sa d should r upon. i s ne i a d stroke. nd. er b shift t l h n o r d. 29. in o -Qhlteh s n siti nl shown in Figures 4 and 5 The solenoid 55 is preferably so arranged (but not necessarily) that when energized, it retains the dog-actuating arm 52 in clutching position, shown in Figure 2, and when de-energizfid, moves.

said arm into deeclutching position whereby the shoulder 49 of the dog 48 is moved into. the path of the solenoid lug 5|, as hereinbefore de-.. scribed, and as shown in Figure 4;.

De-energization of the solenoid may be autoe matieelly f c y e ectri means, u h s a Well known e c ric e e, n ho n, posi i n d shuttle bar I ree: 29, ;up'on its/next fdr'ward' movement of the To :afforda'clearer explanation of the operation' of the clutchcontrol mechanism, wehave diagrammatically indicated in Figure 1, 'a solenoid circuit, generally designated by the numeral 10, having a control switch 50 therein. The circuit Ml may be connected to a suitable source of energy such as the supply circuit to the motor -21, not shown. The switch 50 is preferably so associated with the operating lever (not shown) secured to the shaft that upon initial movement of said lever towards de-clutching position, theswitch 5B is opened, whereupon the solenoid isii'deeenergized and instantly. moves the dog 48 into position to be engaged by the shuttlelug 5|" upon the next forward mcvementof the shuttlebar 36. The opening and closing of the switch 50 is therefore accomplished by manipulation of the control lever on the rock shaft 35, although in some instances it may be arranged for independent operation, if desired. All of the above described mechanisms and controls are more or less well known in the art, and it is therefore deemed unnecessary herein to further describe them in detail.

1 The shuttle bar in the usual press, as previously stated, oscillates back and forth in timed relation-in respect to rotation of the flywheel, and hence it is only at those times when the shuttle 36 and lug 5| carried thereon are moving to the right, in Figure 2, that movement of the control rod 29 to clutch disengaging position can be efiected. Accordingly, in the usual press, the clutch can bedisengaged by power of the press only at certain instances in the press motion cycle, and this is a disadvantage, since instantaneous de-clutching is not thereby afforded.

"One' of the important features of the present invention resides in the provision of a novel and simple mechanism operable in conjunction with the usual clutch control means of the machine for instantaneously moving the clutch control rod'29'into de-clutching position to instantaneo'usly interrupt movement of the work performing member 9, the instant the solenoid is deenergized, whether manually or automatically, and independently of the reciprocal movement 'of 'theshuttle bar 36. The means provided'for thus automatically instantaneously shifting the clutch control rod '29 into de-clutching position, independently of the reciprocal movement of the shuttle bar, is shown comprising an arm 51, which will hereafter be referred to as the primary drive arm. Thisarm is shown having a bearing sleeve 58 secured to its lower end which is pivotally mounted on a stud 59 secured to the machine frame, as best shown in Figure 8. One end of a relatively heavy sprin 6| is shown adjustably connected to the upper end of the drive arm 5'! and the opposite end of said spring is fixed to the machine frame by suitable means such as a bolt or stud 62. The spring 6| is fashioned to constantly exert a force on the arm 51 to move it'in a direction towards the right, when viewed as shown in Figures 3, 4 and 5, or into de-clutching position. When the primary drive arm 57 is in the position shown in Figure 3, the tension in the "spring 5| provides the auxiilary power or force for automatically shifting the clutch control rod 29 into de-clutching position, as will subsequently be described.

"Another arm, generally designated by the numeral 64, and Which 'willhereinafter be refiredtb-Edth "sec'ondary' drive arm? is slidwn mounted on the "outer 'r'educed' end portion'. B5 of ashoiildered stud 66 secured-to the inachine frame, as indicated at 61. -The upper' end-"of the secondarydrive arm 64 is operatively connected to the intermediate portion of the primary drive arm by a connection 68, one'end of which is shown longitudinally adjustable,-- a's indicated at 69 in Figures 3, 4 and 5; The upper end of the secondary drive arm 64 is positioned to engage an abutment screw 'il, adjustably mounted in a member 12 fixedly secured to the clutch control rod 29 by such means'as screws or bolts 13. h :1

Under normal operating conditions, the abutment screw H is so positioned in the member 12 as to provide a small gap between it and the adjacent face of the secondary'drive arm 54, as will be understood by referenceto Figure 3.- When the primary drive arm 57 is released, the secondary drive arm 64 will engage the abut ment screw 15 of the member 12 and thereby instantly shift the clutch control rod 29 into tie-clutching position by the action ofthe spring 6 l as shown in Figures 4 and 5. I

Means are provided for retaining the primary drive arm 51 in energy-storing position, as shown in Figure 3, and comprises a toggle arm, gen eraliy designated by the numeral 75. The toggle arm ?5 comprises a link 16 having one end pivoted to the secondary drive arm 64 by a suitable pivot or pin screw -11. The-opposite end of the link 16 is pivoted to-its complementary toggle link '38 by a pivot pin 9. The opposite end of the toggle link i8 is pivotally connected to a fixed pivot pin ac suitably mounted in the machine frame. One end of the toggle link-l8 is shown forked orsplit', as best indicated 'in Figure 12, thereby to receive the adjacent end of the relatively smaller toggle link 16.

A cross connection or tie it! is provided at the free end of the forked end of the toggle link-l8 adapted to be received in a recess 82 provided in the upper edge of the link 16, and whereby the toggle arm 15, when in operative position as shown in Figure 3, is retained in extended or looking position with the axes of the pivot pins El, 79 and substantially aligned; The toggle arm 75 thus serves to lock the primary drive arm 5! in energy-storing position whereby the arm 5'! is conditioned for instantaneous operation to shift the clutch control rod 29 into (tie-clutching position, the instantthe toggle arm is broken by actuation of the control means or solenoid 55, as will subsequently be described.

A suitable spring 83 has one end connected to the link 16 of the toggle arm 55 and its op posite end to a fixed element such as a projection 8-6 provided onthe stud 65, whereby the spring 83 constantly tends to straighten the toggle arm or move it into operative position to cook the primary and secondary drive arms 5'! and 64, respectively, as shown in Figure 3,.

Means are provided for automatically breaking the toggle arm l5, the instant when the solenoid 55 is actuated to swing the end portion '56 of the arm 52 upwardly into the position shown in Figiire 4, whereby the primary driv arm 5? is'released to thereby instantaneously move the secondary drive arm 64 into engagement with the abutment screw ii and thereby shift the clutch control rod 29 into de-clutching positionshown in Figures 4 and 5, regardless of the position oi'the shuttle lug 5! with; respect to the position of the shoulder '49 "on the dog 48'.

The ameans-provided forrthus breaking-the Itcggle .arm is shown comprising -a control latch '85 pivoted ;on a :stud 86 secured to the machine frame and carrying adjacent one end thereof a depending bracket 81 having its lower end portion 88 offset and extending beneath the :link 16 of the toggle arm 75, as shown in Figures 3,, 4, and '7.

, .A spring 89 has one end connected to the end portion 9I of the control latch .85 and its-opposite =end'is shown connected to a pin 9-2, which, for convenience, maybe secured to the bearing sleeve 5810f the primary drive arm 51,-as will be under-- stood by reference to Figures 3, 4 and 5. The

spring 89 constantly tends toswing the opposite end of the control latch 85 upwardly to .cause the offset portion 88 of the bracket 8'! to engage and break the toggle 15.

When the parts are in clutching position, as

shown in Figure 3, the end portion 59 'of the .clog-.-.actuating arm 52 is held .in engagement with a'roller 93 mounted on the adjacent end of the control latch 85. The downward pressure exerted on the roller 93 by the arm 52 is-suflicient to overcome the tension of the spring 89, whereby so long as the arm 52 is retained in the position shown in Figure 3 by the solenoid, the control latch 85 is retained in substantially .a horizontal position, or in a position whereby the offset end portion '89 of the bracket 81 secured thereto cannotengage and break the toggle The instant, however, that .the solenoid -.is ,de-energized, the end portion 59 of the dog: actuating arm 52 is swung upwardly, thereby releasing the roller 93 and'permitting thespring 8.9 to swing the control latch 85 into the position shown in Figure 4. Such movement of the control latch 85 will cause the portion 89 of the :bracket .81 to engage the bottom of the toggle link I6 and thereby break the toggle arm, wheres upon the primary and secondary drive arms 5'! and B4 are released to instantaneously shift the clutch control rod 29 into de-clutching position, as a result of the secondary drive arm 64 impinging against the abutment screw H carried bythe clutch control rod.

Because of the sudden shifting of the clutch control rod 29 from clutching to de-clutching position by the action of the primary drive arm 51, when said arm is released, means is provided for preventing the clutch control rod 29 from reboundingv when it reaches the limit .of its forward movement, determined by a stop screw 94 received in threaded engagement with an extension 95 provided on the member 72 carried by the clutch control rod 29. The stop screw 94 is adapted to engage a fixed portion of the machine frame, when the clutch control rod 29 is in de-clutching position, as best shown in Fig- ,ures 4, 5 and 6.

The opposite end of the extension 95 is formed with an inclined face 91 adapted to be engaged by a roller 98, as shown in Figures 9, 5 and 6. The roller 98 is carried by one end of a springactuated detent arm 99, mounted on a pivot I9I secured to a bracket I92 suitably fixed to the machine frame. A spring I93 has ene end seated against the upper face of the detent arm 99 and its opposite .end adjustably supported in a fixed bracket I99 by an adjusting screw I95. The roller 98 is preferably adjustably ,mounted in the arm '99 to facilitate properly positioning the clutch control rod 29 when in .de-clutching position.

When the clutch control rod 29 is in ,clutchingposition, as shown vin Figure 3, the roller 9,8

.Qf'lthe .detentarm -99 :will engage the uppergedgie of the extension 95 under the tension of :the spring I93. When the .clutch control rod :29 is shifted to zde-clutching position, the roller -98 drops into-engagement with the inclined face .99 :of the extension .95 which occurs at about the instant the limit stop 94 engages the frame, as

shown .in Figure 5. Such engagement of the ads!- tentroller 98 with theinclined face 91 prevents any possibility of the clutch control rod 29 re: bounding, when the limit stop strokes the ma.- chine frame, as will be understood b reference to .Figure 15..

.Means is provided for automatically :resetting or recocking the primary drive arm 57 each it ?has been-released to automatically .shiftzthe clutch control rod 29 :into de-clutching position.

The means provided for thus resetting or :recooking the primary drive arm is shown com:- prising an arm m6, which will hereinafter be referred to as the setup arm. The lower end of this arm is pivotally mounted on the intermediate portion I91 of the stud 69 and is shown spaced from the secondary drive arms -64 by a suitable washer II9, as best shown in Figuredl). The upper end of the setup arm I99 is=preferably shaped as shown in Figure 6, whereby it has a face I98 positioned in the path of the drive "51! of the shuttle bar 36. A spring I99 has one end fixed to a stud III secured to the machine frame and its opposite end operatively connected totheintermediate portion of the setup :arm '95 through a stud II 2 "fixed to the arm and npin [t3 secured to the stud H2 and laterally extend,- ing therefrom as shown in Figure 9. The setup arm I95 is mounted to oscillate on the stud B6, and the spring I99 serves to constantly urge the face I99 of the arm .596 into engagement with the lug'5I of the shuttle bar.

The shuttle bar 96, as hereinbefore stated, re.- C iprocates continuously as result of its driving connection with the fiyewheel through thegears 33, '45 and 49-41,, whereby the setup arm ,may oscillate between the positions shown in Figures 3 and 5, which represents the length of reciprocal travel of the shuttle bar 36.

The reciprocal movement of the shuttle bar 39 provides the necessary energy or power for .re: setting or recocking the primary drive arm 5! against the tension of the spring GI, when the secondary drive arm 99 is .operatively coupled to the setup arm I99, as will next be described. To provide a driving connection between the setup arm I99 and the secondary drivearm .64, a coupling member H9, shown in full lines Figure 6, is sliolably mounted between suitable guides H5 and H9 provided on the setup 1.96, as best illustrated in Figures 13 and 14. The coupling member H9 is retained in position be: tween the guides H5 and Mt by a strap III which preferably is fitted into recesses provided in the faces of the guides I I5 and I I6 and secured therein by suitable means such as screws I19, The lower end of the coupling member I59 .is provided with a longitudinally extending apere ture I I9 adapted to receive the upper end of :a pin I 2I whose lower end may be fixed in the :lower portion of the setup arm I99, as will be under:- stood by reference to Figure 19. Aspring I 22 -;is shown coiled about the pin IZI between the bote tom end of the coupling member H4 and the bottom of the recess provided in the setup arm I96, whereby the spring constantly exerts an .upward force on the coupling member .I I4 to move 9 it into its uppermost position, shown in Figures 3, 4, and 10.

i The coupling member iI4 has a laterally pro- Jecting drive lug I23 which provides the driving connection between the setup arm I66 and the secondary drive arm 64, when the coupling member H4 is in itslowered position, shown in Figure 6. When the coupling member I I4 is in its uppermost position, the lug I23 may be in engagement with the bottom edge of the strap II'I, as shown in Figures 3 and 10.

The secondary .drive arm 64 is formed with spaced parallel flanges I 24 and I25, as best shown in Figures 6, 13 and 14, and the -.upper end of the flange I 24 is spaced downwardly from the strap II! a distance slightly greater than the up-and-down width or thickness of the lug I23 of the coupling member II4. In other Words, the spacing between the upper end of the flang I24 and the strap II I is suchthat when the lug I23 is in its uppermost position, as shown in Figure 10,,- it may freely pass between the strap-I I1 and thetop end of, the flange I 24 of the secondary drive arm 64 whereby it does not impart any movement of the secondary drive arm. To facilitate machining, we have also shown the upper end of the flange I25 spaced downwardly from the strap IN. I i.

-;;Thus, when the parts are in the positions shown in Figure 4, the setup arm I06 may oscillate freely-between the positionssh wn in Figures 4 and5 withoutimparting any motion to the secondary drive arm'64. -This resultsbecause when the ;drive' lug I23 of the coupling member is :in its uppermost position, it may pass freely backand forthover the upper end of the flange I24- of the setup arm,as will be understood by reference to Figures 9-and 10. 'When the setup arm is-thus uncoupled from the secondary drive arm the springil09holdsthe upper end thereof in engagement with the drive lug H of the shuttle bar 36, as will beunderstood by reference to Figures 3 4 1 n .6.

, To drivinglyconnect the setup arm I06 to the secondary drive arm 64,: the coupling member'I I4 must bemoved downwardly toposition itsdriving lug I23 beneath the-upper-end of the flange I24 of the secondary drive arm, as shown in Figure ;6, whereby the lug I 2 3 may engage the inner face of the fiange .I24,, and therebyreturn the secondary and primarydrive arms to locked or declutchingpositions, as shown in Figure 3. a

The means provided for relatively downwardly movingthe coupling member I I4 in the setup arm ing, movement of the setup arm in a direction towards the right, Whemviewed as shown in Figures'.3,' 4 and 5, provided the control latch 85 is in the positions'hown inFigures 3 and 5. Such relative downward .movement of the coupling member I 14 in the setup arm I06 willposition the drive mg I23of the coupling memberin driving relation to the flange I24 of the secondary drive ea seme ure 10 A spring I 28 has one end connected to the pressure element I26 and its opposite end to the lower end of a bracket I29 depending from and fixed tothe lower edge of the control latch 85, as shown in Figures 3, 4, 5 and 6. A pin I3I may be secured in the control latch to limit the downward movement of the pressure element I26,

as will be understood by reference to Figure 6.

An important feature of the construction shown in Figure 6 resides in the relative strengths of the two springs I22 and I28. The spring I 28 of the pressure element I26. must be relatively greater than the tension or strength of the spring I22 so that when the control latch 85 is actuated to permit the pressure element I26 to downwardly press the coupling member II4, as shown in Figure 6,

I34 provided on the adjacent end of the controlv latch 85, as shown in Figures 5 and 6. Asm'alll.

spring I35 may be interposed between the upper end of the auxiliary latch I32 and the pivot pin connectingthe dog actuating arm 52 to the con;..'

nection 54, as shown in Figure 6, to constantly urge the detent I33 of the auxiliary latch into locking engagement with the shoulder I34 on the control latch 85. to lock the control latch 85 in its horizontal look.- ing position, shown in Figures 5 and 6.

When the clutch control rod 29 is manually shifted from clutching to de-clutching position by manipulation of the rock shaft 35, as shown. in Figure 3-A, the auxiliary latch member I32 instantaneously moves into locking engagement with the adjacent end of the control latch 85 whereby the control latch-cannot break the togglelink 15, in the event the dog actuating arm 52.is subsequently moved into .de-clutching s sition, as shown in Figure'l, while the clutch controlrod 29 is in de-clutching position. The auxiliary latch, member I32 thus prevents the unnecessary release of the primary and sec-. o'nda'ry drive arms 57 and 64, respectively,: in. the event the clutch'control rod is manually. shifted from clutching to declutching position by manual manipulation of therock shaft 35.

To condition the primary and secondary drive arms for instant release to instantaneously automatically shift the control rod 29 from clutching to tie-clutching position, upon actuation of the,

solenoid switch 50, means is providedfor render;

ing theauxiliary latch member I32 inoperative when the parts are in cocked positions, as show n in Figure 3 v Byreference to this figure, it Will be notedthat the detent I33 of the auxiliary latch control latch 85 may be swung upwardlyrbythe springa to break the toggle link-l5, when released to do so as when the end portion 56 of;

the dog-actuating arm 52 is swung out of engagemcnt with the roller 93, upon de-ener'gi zation of the solenoid 55. Such upward swinging movement of the control latch 85 will cause the toggle link'l5 to be broken as result of the lower;

end portion ofthe bracket 81' of the control The auxiliary latch I32 serves 532 has been moved out of engagement with the; shoulder I34 of the control latch 85, whereby the latch engaging the arm 16; ofthe-togg'le link 15 andthereby breaking the toggle link and releasingZthe-primary and secondary drive arms 51 and 641 respectively, as shown in Figures 4 and 5-;

To thus render the auxiliary latch element l'3-2 ineffective to lock the control latch 85 in operative position, an extension arm I35 is provided on the member 12 secured to the clutch control rod 29; and is shown having: a; suitable abutment screw I 37 adjustably secured to the outer end thereof. The terminal of the adjusting screw I3! is adapted to engage an offset lug 138' provided on' the upper end of the auxiliary latch element I132; This lug is so positioned withrelation' to the'abutment screw I31 on the extension arm I 36, that'when theclutch control rod '49 is shifted into cliltching position, shown in Figure 3, thea'butment screw I 31- will engage the lug I38 in the upper end of theauxiliary latch I32 and thus dis: engage the detent r33 of the'latch element fro-m the shoulder- I 34" of the control'latch- 85, as will readilybe understood by reference to Figure 3-;

' Immediately upon manual shifting ofthe clutch controi'rod' 29'from clutching, position, shownin Figure 3; to de-clutching position shown in'Figurs 5 and 6; the auxiliary latch I3! is released from the screw I31 whereupon the spring I35 thereof'instantly moves the auxiliary latch element into position whereby its detent I33 will engage the shoulder. 83 3 of the control latch 85; and thusprevent the unnecessary release of the priinaryand secondary'drive arms, each time-the clutch control rod 29 is manually shifted into de-clut'ching position by the operator.

In accordance; with conventional practice, we

Operation As hereinbefore' stated, in conventional ma- I chines of the" character herein disclosed, the actual shifting of the clutch control rod 29' is accomplished by the shuttle bar 36 as a; result of its driving lug 5| engaging the shoulder 49 of the clutch dog 48. Such shifting of the clutch control rod 29 has not been satisfactory inhigh speed machines because of thedelayed action of shifting the clutch control rod 29, which may result'in the event the clutch dog 48 is moved into d'e-clutching position when the drive lug 5| of the'shuttle bar 36 has passed by the shoulder 49 of the dog 48, during the forward movement of theshuttle bar. When such a contingency arises, theclutch control rod 29 cannot be shifted by the shuttle bar until the shuttle bar commences itsnex-t cycle of reciprocal movement, and' consequently a delayed action may result in the shifting of the clutch control rod from clutching die-clutching position. By theemployment of thenovel invention hereifidescribed the danger of delayed clutch action is positively eliminated, and each time the solenoid' control switch is opened, the clutch control rod 29' is instantaneously shifted from clutching tode-clutching position regardless of the position of" the shuttle bar.

To accomplish the above results, the release of the primary and secondary drive arms 5'! and 64; respectively, from cooked to clutching positions,

shown in' 3, to de-clut'ching position; is effected by opening of the solenoid s'witch5'0, as hereinbefore described. Such opening of the solenoid switch 56 causesthe clutch dog'actuati 'rigarm to release the control latch 85, whereupon:

the latter instantly breaks to toggle link 15, as shown in Figures 4 and 5, and thus permits the. secondary drive 'arm instantaneously to shiftthe clutch control rod 29 into de-clutching position; independently of any action of the shuttle bar367.

The control latch which provides the means for breaking the toggle link 15'', is retained in horizontal or cooked position as shown in Figures 3, 5* and 6, when the solenoid is energized, because: of the end portion 56 of the dog actuating arm 52 engaging the roller 93 mounted on the adjacent"' end of 'the control latch. The toggle link is nor mally retained in operative position by the action of the spring 83 whereby'an upward forcemust: be exerted on the toggle link to break it and cause it quickly to release the primary and sec ond'ary drive arms from their operative positions; shown in Figure 3. When the primaryand se'c ond'ary drive arms 5'! and 64, respectively, areim operative or clutchin positions, the main power spring 6| is extended and thus has energized or. conditioned the primary drive arm for immediate action to shift the clutch control rod 29 into de'e clutching position; the instantit is called upon todo so" by the solenoid;

When. the solenoid circuit is Opened by the will of the operator or by some automatically operable control device, the usual spring of the-=- sol'enoid will instantaneously swing the dog'actuated element 52'f rom the'p'osition shown in'Fifg ure' 3- to that shown in Figure 4 whereby the adj'a cent'end of the clutchcontrol latch 85 is swung upwardly tothe position shown in Figure 4.; by the action of'thesp'ring '89 secured to the opposite" end portion 91 thereof. Such upward swinging movement of the controfl'atch 85 will' cause me offset end"- portion 88 of the bracket 8'! of the control latch to engage and break the togglelink; thereby instantaneously releasing the primary and seco'ndarydrive smear and 64} whereby the secondary drive arrnwill engage the abut ment screw H of the abutment member 12-, car ried by the" clutch cnt-r'ol rod" 29, and thereby instantaneously shift control rod into de clutchiiig position, independently of any action of the shuttle bar, and regardless of the position of the shuttle bar with respect to the clutch dog 48 V In this automatic and instantaneous opening action, lug 5! on shuttle barhas no effect upon do'g- 48 since the clutch control" rod- 29-is driven smartly to clutch-out positionby the hammer blow of secondary drive am 64 upon screw 7|" (carried by 111g 12 on rod 29). As the clutch control rod moves to-the right (towards clutch openposition, it merely drags dog 48 along; with it; Indeed, dog 48 can be'removed from the'ap= paratus once the automatic and instantaneous clutch opening device oft-his inventionha'sbeen installed; 7

Solong as the solenoidswitch 50 is retained in circuit opening" position the primary andsec ondary drive arms will remain in de-clut'ching' position, as shownin Figures 4 and 5, because when the solenoid switch is open the solenoid will retain the dog actuatingiarm 52in the pose tion' shown in Figure 4; whereby the control latch. 85 is retained in the-position shown in Figure 4 by'the spring 891 Immediately upon closing of the solenoid switch 56 the clutch dog actuating-arm ,52 is swungtothe position shown in Figures 3 and 5, whereby itszend portionlit engages the roller 93 of-the control latch 85, and thus positions the control latch for cooking or resetting the primary and secondary drive arms 51 and 64, respectively. Such resetting of the drive arms 51 and 64 is effected automatically by drivingly connecting the setup arm IE6 to the secondary drive arm 64 through the medium of the coupling member I I4.

3. Such automatic couplin together of the setup arm I06 and secondary drive arm 64 results following resetting of the control latch 85, upon the next forward movement of the shuttle bar 36, because the head or end portion I27 of the pressure element I26 then engages the upper end of the coupling member It and presses said memher downwardly between the flanges I24 and I25 of the secondary drive arm, as shown in Figure 6,.whereby the drive dog I23 of the coupling member is moved into the path of the upper end of theflange I24 of the secondary drive arm. When the coupling member is thus pressed downwardly in the secondary drive arm, the setup arm I06 is drivingly connected or coupled to the secondary drive arm through the lug I23 and flange I24, whereby upon the next rearward movement of the shuttle bar 36, the secondary drive arm 64 is moved from its released position shown in Figures 4 and 5, to the position shown in Figure 3, in which position it will be reset or cooked by straightening of the toggle link I5 under the influence of the spring 83. Such resetting of the secondary drive arm will effect a similar resetting of the primary drive arm as a result of being connected thereto by the connection 68.

Such resetting of the primary and secondary drive arms may be accomplished even though the clutch control rod 29 is retained in de-clutching position, as will be noted by reference to Figure whether manually or automatically, it mustbe manually returned to clutching position, shown in Figures 1 and 3. 7

From the foregoing it will therefore be understood that the novel clutch operating mechanism r herein-described, is adapted for either manual or automatic operation, or both, and serves topositively instantaneously shift the clutch control rod 29 into de-clutching positionthe instant the control device such as the solenoid switch ,58 is opened, whether by the operator, or by automatic means which may be rendered operative as a result of failure of the machine to perform its prescribed function upon the work.

It will be apparent to those skilled in the art that we have accomplished at least the objects of our invention, and that the embodiments herein described may be variously changed and modified without departing from the spirit of the invention, and that the invention is capable of uses and has advantages not herein specifically described; hence it will be appreciated that the herein disclosed embodiments are illustrative only. and that our invention is not limited theerto.

, What we claim is:

1. A work performing machine having a frame, a work member movably mounted on said frame and normally movable cyclically through a' prescribed path, a constantly movable power source on said frame adapted to be connected through'a clutch to the work member, said clutch being provided with a clutch control member movable in opposite directions to clutching and de-clutching positions, a manual control for moving the clutch control member to clutching or de-clutching position, automatic means connected to said clutch control member, said automatic means including a source of potential instantly available energy for moving said clutch control member only in the direction to de-clutch the machine at any time during the cyclicaloperation of the machine, and detent means for restraining movement of said automatic means from such de-clutching when the clutch control member is manually moved into declutching position.

2. A work performing machine having a frame; a work member movably mounted on said frame and movable cyclically through a prescribed path; a constantly movable power source on said frame adapted to be connected through a clutch to the work member, said clutch being provided with a clutch control member movable in opposite directions to clutching and de-clutching positions, a manual control for moving the clutch control member to its clutching or de-clutohing positions, spring means, means capable of connecting said spring means to the constantly mov able power source for moving the spring means to energy-storing position, control means for,

connecting said spring means to said clutch control member whereby the spring means can move the clutch control means to de-clutching position only, at any time during the cyclical operation of the machine, and detent means operable to engage said spring means for restraining said de-clutching movement thereof when the clutch control member is manually moved to de-clutching position.

3. A work performing machine having a frame,

clutch control member movable in opposite directions to clutching and de-clutching positions, a manual control for moving the clutch control member, a power spring, connection means attached to said spring and mounted on the frame, saidconnection means being engageable to a part of the constantly movable power source for moving said spring to energy-storing condition, means for restraining said connection means and spring in said energy-storing condition, control means movable at any time dur ing the cyclical operationof the machine for releasing said restraining means to allow move ment of said connection means under influence 4. Iln a work performing machine of the type.

having a reciprocating work performing head driven through repeated cycles of operation from a constantly revolving power source throughlsa clutch having a clutch control member movable to clutching and de-clutching positions, manual means for moving said. clutch control membenfla part e aid m c n h n periodical yavail" able motion, and means capable of connecting said-"clutch control member tosaid part for mov ingtne clutch control member to de-clutching position when the motion of said partis'a'vailable, the improved clutch operating mechanism comprising an energy-storing member, meansfor connecting said energy-storing member to the clutchcontrol member whereby manual shifting of the clutch control member to clutch-engaging position will movethe energy-storing member to energy-storing condition, restraining said member in energy-storing: con dit'ion, said energy-storing member when released being: movable along apath, under. the influence of its-stored. energy, to. engage the clutch. control member at any time during the cycle of motiofi of the work performing: head and instantly shift the clutch control member; to de -clutching. position;

5: In a. work performing machine? of the type? having a reciprocating work. performing head driven through repeated cycles from a: constantly revolving power source through a clutch. having a: clutch control member" movable to clutching:

and de-clutching positions, manual means. for moving. said. clutch control member, a part. on said machine having a periodically available motion, an improved. clutch operating mechanism comprising an energy-storing member, means for connecting said energ-y storing member. to a. movableelement of the-machine for a time period.

atleastusuiiicient to movesaid member to ener ystoring condition, detent means for restraining said' member in. energy-storing condition, said energystoring member and connecting means having a path of motion such that when it is clutching and de-clutching positions, manually operable means for effecting movement of said clutch control member, a part on said machine having a periodically available motion, the improved clutch operating mechanism comprising av spring mounted onthe machine, connection means attached to said spring. and having a path of motion such. thatwhen moved by said spring it will engage the clutch control member and. move it to de-clutching position, movable means for operatively connecting the connection means tosaidper-iodically movable part to move the spring and said connection means to a positionwherein. energy is. stored in the spring, toggle. arm connected. to. the connection. means and to a fixed part of the machine frame for holding the connection means in energy-storing position when the toggle arm is in straightened.

condition, and a control latch for breaking the toggle arm at any time during the cycle of operation of" the machine: whereby said connection means is'released to thereby engage and shift the clutch control member into de-clutching position.

7-; A: work performing machine of the type having a; reciprocating work performing head driven through repeated cycles" of operation from" detent means for I36 a constantly revolving power source through a: clutch having a clutch control member movable. to: clutching and de-clutching positions,- manuw all'y operable: means for effecting movement: ofz said clutch. control member, a part on said mer chine having a periodically available: motion;. the improved clutch' operating mechanism compriseing'alspring mounted on the machine, connection; means attachedto said spring'and havingi apathi of motion. such that. when moved by' saiilispri-ne; it will engage the clutch control member and move'it to: de-clutching position, movable means; for'operatively connecting the connection means to said periodically. movable: part to: move the: spring and said connection means to a position: wherein energy is stored in the spring, a. toggle arm= connected to the connection means and to? a fixed part of the machine: frame. for holding;

the connection means in energy-storing position,-,

whenthe toggle arm isin straightened condition a control latch for breaking the toggle arm whereby at any time during the cycle of operation: of the machine said connection means is released to. shift the clutch control member into de-clutch-ring position, and a solenoideoperated element: for controlling. operation of the control latch.

8. A work performing machine of the type havinga reciprocating Work performing head. driven throughv repeated cycles of operation-from; a constantly revolving power source through a. clutch having a clutch control member movable to clutching and: de-clutching positions, marin ally operable means for effecting movement. of said clutch control member, a part on said ma:- chine having a periodically available motion, the: improved clutch operating mechanism comprise ing a spring mounted on the machine, connec tion means attached to said spring and having a path of motion such that when movedby said. spring it will engage the clutch control member and move it to de-clutching position, movable means for operatively connecting the connec#- tion means to said periodically movable part to move the spring and saidconnection means to a position wherein energy is stored in the spring; rea ily releasable means for retaining said. connection means in energy-storing position, and; anabutment on the clutch control rodpositionediin the path of travel of the connection means whereby when the connection means is released,it willi impart a forceful blow to said abutment and thereby quickly shift the clutch control member. into. de-clutching. position.

9. In a machine comprising a reciprocating. work performing, head driven from a constantly operating Work source through a clutch. having a clutch control member movable to clutching and de-clutching positions, ashuttle bar mounted. for continuous movement in timed relation to the power source, and a control device for. operatively connecting the clutch control member to the shuttle bar whereby the shuttle bar may shift the clutchcontrol member into de-cl'utch ing position, an auxiliary clutch control mecha nism mounted on the machine frame, said mechanism including a spring-actuated impact memj her, detent means for retaining the impact meim. ber in energy-storing condition, and means made operable by actuation of the control device t6 render said detent means ineffective to restrain movement of the impact member whereby" the impact member is released, impacts and shifts. the clutch control member into de-clutchi'ng position independently of the movement of the shuttle bar.

10.- In a machine comprising a reciprocating work performing head driven from a constantly operating power source through a clutch having a clutch control member movable to clutching and de-clutching positions, a shuttle bar mounted for continuous movement in timed relation to the power source, a manual control for manually operating the clutch control member, and a solenoid-operated control element for operatively connecting the clutch control member to the shuttle bar whereby the shuttle bar may shift the clutch control member into de-clutching position, an auxiliary clutch control mechanism mounted on the machine frame, said mechanism including a spring-actuated impact member, detent means for retaining the impact member in energy-storing condition, means made operable by actuation of the solenoid-operated control element for rendering said detent means ineffective to restrain movement of the impact member whereby the impact member is released, impacts and shifts the clutch control member into declutching position independently of the movement of the shuttle bar, and means for retaining the impact member in energy-storing position when the manual control is operated to manually shift the clutch control member into de-clutching position.

11. In the machine comprising a reciprocating work performing head driven from a constantly revolving power source through a clutch having a clutch control member movable to clutching and de-clutching positions, a shuttle bar mounted for continuous oscillatory movement, and manually controlled means for operatively connecting the clutch control member to the shuttle bar for shifting the clutch control member into declutching position, and a mechanism under control of the operator for shifting the clutch control member into de-clutching position, said mechanism comprising a drive arm having a spring connected thereto, means for positioning said arm to store energy in the spring, detent means for retaining the arm in energy storing position, an abutment element on the clutch control member positioned in the path of movement said arm when it is moved by said spring, and a solenoid-operated control device for rendering said detent means ineifective to restrain movement of said arm whereby the arm may be released to shift the clutchicontrol member into declutching position independently of the movement of the shuttle bar.

12. In a machine comprising a work performing head driven from a constantly operating power source through a clutch having a clutch control member movable to clutching and declutching positions, a shuttle bar mounted for continuous oscillatory movement in timed relation to the power source, and a solenoidoperated control device for operatively connecting the clutch control member to the shuttle bar whereby the shuttle bar may shift the clutch control member into de-clutching position, an auxiliary clutch operating mechanism including a springactuated impact member, an abutment element on the clutch control member positioned in the path of movement of the impact member when it is actuated by said spring, a toggle for restraining said impact member in energy-storing position, when the toggle is in a straightened condition a control latch for actuating the toggle, a pivoted element connected to the solenoid operated control device and normally positioned to restrain the control latch out of engagement with the toggle arm, a setup arm having one end arranged to be engaged by the shuttle bar whereby 18 the setup arm may be oscillated about its axis, means actuated by the control latch for coupling the setup arm to the impact member whereby the impact member is moved into energy-storing position by movement of the shuttle bar, and means whereby when the solenoid-operated control device is actuated to move said pivoted element out of engagement with the control latch, said control latch will engage and break the toggle arm whereby the impact member is released and shifts the clutch control member into declutching position independently of the movement of the shuttle bar.

13. In a machine comprising a reciprocating work performing head driven from a constantly revolving power source through a clutch having a clutch control member movable to clutching and de-clutching positions, a shuttle bar mounted for continuous oscillatory movement, and a solenoid-operated control element for operatively connecting the clutch control member to the shuttle bar for shifting the clutch control member into de-clutching position, an auxiliary clutch operating mechanism for automatically shifting the clutch control member into de-clutching position independently of the movement of the shut tle bar and at any time during movement of the reciprocating work performing head, said mech anism including a primary drive arm, a spring connected to one end of said arm, a secondary drive arm operatively connected to the primary drive arm and adapted to engage an abutment on the clutch control member to shift said member to de-clutching position, when the drive arms are released, a toggle arm having one end connected to the secondary drive arm and its opposite end to a fixed part of the machine frame and adapted to restrain the drive arms in energystoring positions, when the toggle is in a straightened condition, a control latch for breaking the toggle arm, said solenoid-operated control element normally holding the control latch from breaking the toggle arm, and a control device electrically associated with the solenoid and whereby the solenoid may be actuated to operate said control element and release the controi latch, whereby the toggle arm is broken and the drive arms released to shift the clutch control member into de-clutching position independently of the movement of the shuttle bar.

14. In a machine comprising a reciprocating work performing head driven from a constantly operating power source through a clutch having a clutch control member movable to clutching and de-clutching positions, a shuttle bar mounted for continuous oscillatory movement, and a solenoid-operated control element for operatively connecting the clutch control member to the shuttle bar for shifting the clutch control member into de-clutching position, an auxiliary clutch operating mechanism for instantaneously shifting the clutch control member into de-clutching position independently of the movement of the shuttle bar, said mechanism including a primary drive arm, a spring connected to one end of said arm and to the machine frame for moving the arm in one direction, a secondary drive arm operatively connected to the primary drive arm and adapted to engage an abutment on the clutch control member to shift said member to declutching position when the drive arms are released and moved by said spring, a toggle arm having one end connected to one of said drive arms and its opposite end to a fixed part of the machine frame and adapted to restrain the drive arms and spring in energy-storing positions, when the toggle is in a straightened condition, a control latch for breaking the toggle arm, said solenoid operated control element normally holding the control latch from breaking the toggle arm, a control device electrically associated with the solenoid and whereby the solenoid may be actuated to operate said control element and release the control latch whereby the toggle arm is broken and the drive arms released to shift the clutch control member into de-clutching position independently of the movement of the shuttle bar, and means for coupling one of said drive arms to the shuttle bar whereby the drive arms may be automatically reset to energystoring position by movement of the shuttle bar.

15. In. a machine comprising a reciprocating work performing head driven from a constantly revolving power source through a clutch having a clutch control member movable to clutching and de-clutching positions, a shuttle bar mounted for continuous oscillatory movement, a manual control, and a solenoid-operated control element for operatively connecting the clutch control member to the shuttle bar for shifting the clutch control member into de-clutching position, an auxiliary clutch operating mechanism for automatically shifting the clutch control member into de-clutching position independently of the movement of the shuttle bar, said mechanism including a primary drive arm, a heavy spring connected to one end of said arm and to the machine frame for moving the arm in one direction, a secondary drive arm operatively connected to the primary drive arm and adapted to engage an abutment on the clutch control member to shift saidmember to de-clutching position when the drive arms are released and moved by said spring, a toggle arm connected to one of said drive arms and to a fixed part of the machine frame and adapted to restrain the drive arms and spring 20 in energy-storing positions, when the toggle is in a straightened condition, a control latch for breaking the toggle arm, said solenoid-operated control element normally holding the control latch from breaking the toggle arm, a control device electrically associated with the solenoid and whereby the solenoid may be actuated to operate said control element and release the control latch whereby the toggle arm is broken and the drive arms released to instantaneously shift the clutch control member into de-clutching. position independently of the movement of the shuttle bar, means for coupling one of said drive arms to the shuttle bar whereby the drive arms. may be automatically reset to energy-storing, position by movement of the shuttle bar, and detent means controlled by movement of the clutch control member to lock the control latch against movement, whereby the clutch control member may be manually shifted into de-clutching position by said manual control without releasing said drive arm.

HARRY WILLIAM HOFFMAN. STANLEY M. CUMMINGS.

REFERENCES CITED The following references are of record in the file of this patent? UNITED STATES PATENTS Number Name Date- 1,129,762 Townsend Feb. 23, 1915 1,194,379 Gouldbourn et a1. Aug. 15, 1916 1,338,086 Kendall Apr. 27, 1920 1,383,525 Carroll July 5, 1921 1,580,923 Selvig Apr. 13, 1926- 1,640,530 Burton Aug. 30, 1927 2,152,044 Gross Mar. 28, 1939 2,171,841 Barney et al Sept. 5, 1939 2,260,416 Wentworth et al. Oct. 28, 1941 2,272,500 Andres et a1 Feb. 10, 1942 

